Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual era a nacionalidade do jogador escolhido no. 168?
 ###Tabelas: CREATE TABLE michigan_36_drake_4 (michigan_36_drake_4_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Touchdowns INT, Extra points INT, Field goals INT, Points INT) CREATE TABLE attendance (attendance_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Home Gms INT, Home Total INT, Home Avg INT, Top Home Crowd VARCHAR, Road Gms INT, Road Total INT, Road Avg INT, Overall Gms INT, Overall Total INT, Overall Avg INT) CREATE TABLE season_1:_2007–2009 (season_1:_2007–2009_id AUTO_INCREMENT PRIMARY KEY, Prod. No. VARCHAR, Title VARCHAR, Written by VARCHAR, Directed by VARCHAR, Original airdate VARCHAR) CREATE TABLE round_nine (round_nine_id AUTO_INCREMENT PRIMARY KEY, Pick # INT, Player VARCHAR, Position VARCHAR, Nationality VARCHAR, NHL team VARCHAR, College/junior/club team VARCHAR) CREATE TABLE round_robin_results (round_robin_results_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Wins VARCHAR, Losses VARCHAR, Points VARCHAR, WPct. VARCHAR, G.F. VARCHAR, G.A. VARCHAR, Assists VARCHAR, Penalties VARCHAR, P.I.M. VARCHAR)  
SELECT Nationality FROM round_nine WHERE Pick # = 168